The emergence of metalenses has impacted a wide variety of applications such as beam steering,imaging,depth sensing,and display projection.Optical distortion,an important metric among many optical design specification...The emergence of metalenses has impacted a wide variety of applications such as beam steering,imaging,depth sensing,and display projection.Optical distortion,an important metric among many optical design specifications,has however rarely been discussed in the context of meta-optics.Here,we present a generic approach for on-demand distortion engineering using compound metalenses.We show that the extra degrees of freedom afforded by a doublet metasurface architecture allow custom-tailored angle-dependent image height relations and hence distortion control while minimizing other monochromatic aberrations.Using this platform,we experimentally demonstrate a compound fisheye metalens with diffraction-limited performance across a wide field of view of 140°and a low barrel distortion of less than 2%,compared with up to 22%distortion in a reference metalens without compensation.The design strategy and compound metalens architecture presented herein are expected to broadly impact metasurface applications in consumer electronics,automotive and robotic sensing,medical imaging,and machine vision systems.展开更多
Wide field-of-view(FOV)optics are essential components in many optical systems,with applications spanning imaging,display,sensing,and beam steering.Conventional refractive wide FOV optics often involve multiple stacke...Wide field-of-view(FOV)optics are essential components in many optical systems,with applications spanning imaging,display,sensing,and beam steering.Conventional refractive wide FOV optics often involve multiple stacked lenses,resulting in large size and weight as well as high cost.Metasurface lenses or metalenses promise a viable solution to realizing wide FOV optics without complex lens assembly.We review the various architectures of wide FOV metalenses,elucidate their fundamental operating principles and design trade-offs,and quantitatively evaluate and contrast their imaging performances.Emerging applications enabled by wide FOV metasurface optics are also discussed.展开更多
Rollable photonic devices that can adapt to freeform surfaces with reduced dimensions while maintaining their original functionalities are highly desirable.Among photonic devices,metamaterials with hyperbolic dispersi...Rollable photonic devices that can adapt to freeform surfaces with reduced dimensions while maintaining their original functionalities are highly desirable.Among photonic devices,metamaterials with hyperbolic dispersion in momentum space,defined as hyperbolic metamaterial(HMM),possess a large photonic density of states that has been proven to boost light-matter interaction.However,these devices are mainly developed on rigid substrates,restricting their functionalities.Here,we present the attempt to integrate flexible and rollable HMMs consisting of polymer and metal multilayers on paper substrate.Quite interestingly,this design enables to exhibit high photonic density of states and scattering efficiency to enhance stimulated emission and induce pronounced laser action.The flexible and rollable HMM structure remains well its functionalities on freeform surfaces with curvature radius of 1 mm,and can withstand repeated bending without performance degradation.The intensity of laser action is enhanced by 3.5 times as compared to the flat surface.We anticipate that this flexible and rollable HMM structure can serve as a diverse platform for flexible photonic technologies,such as light-emitting devices,wearable optoelectronics,and optical communication.展开更多
文摘The emergence of metalenses has impacted a wide variety of applications such as beam steering,imaging,depth sensing,and display projection.Optical distortion,an important metric among many optical design specifications,has however rarely been discussed in the context of meta-optics.Here,we present a generic approach for on-demand distortion engineering using compound metalenses.We show that the extra degrees of freedom afforded by a doublet metasurface architecture allow custom-tailored angle-dependent image height relations and hence distortion control while minimizing other monochromatic aberrations.Using this platform,we experimentally demonstrate a compound fisheye metalens with diffraction-limited performance across a wide field of view of 140°and a low barrel distortion of less than 2%,compared with up to 22%distortion in a reference metalens without compensation.The design strategy and compound metalens architecture presented herein are expected to broadly impact metasurface applications in consumer electronics,automotive and robotic sensing,medical imaging,and machine vision systems.
基金Funding support was provided by the Defense Advanced Research Projects Agency,the Defense Sciences Office(DSO)Programs:EXTREME Optics and Imaging(EXTREME)under Agreement No.HR00111720029the Enhanced Night Vision in Eyeglass Form(ENVision)under Agreement No.HR001121S0013.
文摘Wide field-of-view(FOV)optics are essential components in many optical systems,with applications spanning imaging,display,sensing,and beam steering.Conventional refractive wide FOV optics often involve multiple stacked lenses,resulting in large size and weight as well as high cost.Metasurface lenses or metalenses promise a viable solution to realizing wide FOV optics without complex lens assembly.We review the various architectures of wide FOV metalenses,elucidate their fundamental operating principles and design trade-offs,and quantitatively evaluate and contrast their imaging performances.Emerging applications enabled by wide FOV metasurface optics are also discussed.
基金This work was financially supported by the“Advanced Research Center for Green Materials Science and Technology”from The Featured Area Research Center Program within the framework of the Higher Education Sprout Project by the Ministry of Education(108L9006)the Ministry of Science and Technology in Taiwan(MOST 108-3017-F-002-002 and MOST 108-2112-M-002-019)H.I L.acknowledges fellowship support from the Ministry of Science and Technology Overseas Project for Post Graduate Research,Taiwan(108-2917-I-002-010).
文摘Rollable photonic devices that can adapt to freeform surfaces with reduced dimensions while maintaining their original functionalities are highly desirable.Among photonic devices,metamaterials with hyperbolic dispersion in momentum space,defined as hyperbolic metamaterial(HMM),possess a large photonic density of states that has been proven to boost light-matter interaction.However,these devices are mainly developed on rigid substrates,restricting their functionalities.Here,we present the attempt to integrate flexible and rollable HMMs consisting of polymer and metal multilayers on paper substrate.Quite interestingly,this design enables to exhibit high photonic density of states and scattering efficiency to enhance stimulated emission and induce pronounced laser action.The flexible and rollable HMM structure remains well its functionalities on freeform surfaces with curvature radius of 1 mm,and can withstand repeated bending without performance degradation.The intensity of laser action is enhanced by 3.5 times as compared to the flat surface.We anticipate that this flexible and rollable HMM structure can serve as a diverse platform for flexible photonic technologies,such as light-emitting devices,wearable optoelectronics,and optical communication.
